将double转换为字符串

double num = 123.456;
String str = Double.toString(num);

num = 123.456
str = str(num)

let num = 123.456;
let str = num.toString();

#include<iostream>
#include<string>
#include <sstream>

int main() {
    double num = 123.456;
    std::ostringstream ss;
    ss<< num;
    std::string str = ss.str();
    std::cout<< str<< std::endl;
    return 0;
}

double num = 123.456;
string str = num.ToString();